The scale of the task facing Tony Blair in his drive to help Africa was laid bare yesterday when it emerged that Nigeria's past rulers stole or misused £220 billion. That is as much as all the western aid given to Africa in almost four decades. The looting of Africa's most populous country amounted to a sum equivalent to 300 years of British aid for the continent. Former leader Gen Sani Abacha stole between £1bn and £3bn The figures, compiled by Nigeria's anti-corruption commission, provide dramatic evidence of the problems facing next month's summit in Gleneagles of the G8 group...